Trick cripples any bulky or transition mon the opponent may send in. If holding Specs, Trick can be used to bait a physical attacker in and force it into one move while not gaining any bonus. Similarly, Scarf hurts Stall teams by giving their insanely slow members a marginal speed boost.

Hidden Power Fire hits all of the common Steel types, bar Heatran, for supereffective damage.

Protect scouts for Choiced attacks.

Hidden Power Ice lets Gengar hit Garchomp.

Thunderbolt hits Bulky waters for SE damage.

Additional Comments

HP Ice can be used to hit dragons instead.

Substitute can be used to block status; however, it increases Gengar's frailty.

Taunt can be used to prevent the opponent from the enemy from healing or statusing Gengar.

Psychic hits bulky Fighting types such as Roobushin.

Teammates & Counters

Zuruzukin provides great offensive synergy as not only do they resist each other's weaknesses, Gengar can hammer the Physical walls that prevent Zuruzukin from sweeping and Zuruzukin can beat up the Special walls that prevent Gengar from switching in.

[Team Options]

Fighting types such as Roopushin appreciate Gengar's ability to dent bulky Ghosts and Grounds. Similarly they can handle Special walls that Gengar may have to face.

Gengar will appreciate hazards, especially Toxic Spikes as the additional damage per turn pressures Special walls such as Blissey.

Gengar's immunity to Fighting, Ground, and Normal make it a prime candidate to handle physical threats such as Roopushin invite teammates such as Doryuuzu to sweep.

[Optional Changes]

Evil Eye can be used in Conjunction with Toxic Spikes to have a powerful Base 150 move (including STAB).

Destiny Bond can be used to net a surprise kill.

Will-o-Wisp can be used on the switch-in to burn the incoming physical attacker to help out your team if Gengar has done its job.

Grudge could be used as a gimmick.

Psychic hits nearly all the Fighting Types that threaten Gengar.

If Focus Blast's accuracy deters you from using a fighting type move, Hidden Power Fighting is an alternative with 100% accuracy, albeit with much weaker power

Taunt is also a weapon to prevent opposing walls from setting up or healing. However, it requires a lot of prediction. A mispredict could cost you the Gengar.

Hidden Power Ice hurts non-Yache Garchomp.

[Counters]

Tyranitar defeats Gengar if it does not lack Focus Blast. If Gengar defeats it, Doryuuzu outspeeds it and KOs with Rock Slide.

Would 0 HP Ivs help Pain Split on the SubSplit set (Less HP = Less average remaining HP) ? Also make sure the HP is divisible by 16 + 1, this way unless there is Hail/Sandstorm, Gengar can make 4 Subs, and be at 1 HP, rather than make 3 and be at 25%. This also makes Pain Split do more damage if Gengar is at 1 HP.

Moderator

Would 0 HP Ivs help Pain Split on the SubSplit set (Less HP = Less average remaining HP) ? Also make sure the HP is divisible by 16 + 1, this way unless there is Hail/Sandstorm, Gengar can make 4 Subs, and be at 1 HP, rather than make 3 and be at 25%. This also makes Pain Split do more damage if Gengar is at 1 HP.

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I'm not sure having 0 IVs does make a difference with Gengar's low base HP. Gengar's HP is 261 with the given EVs on the SubSplit set in the OP. (15 * 4 +1 = 61). Also, odds are that Shadow Ball or Focus Blast will do more damage to this to Gengar's foes in this offensively oriented meta than Pain Split will do.

I think that you may also add in OC little mention about new boosted Disable. Disable with Subtitute and Toxic Spikes support may be extremely annoying against non-prepared teams. But Toxic Spikes is a must. Or if you think it's viable enough, slash it in SubSplit set in place of Focus Blast.

I don't think Psychic even deserves a slash on the Choice set. You're going to lock yourself into an attack that common Pursuit-users are immune to/resist? Seems like a bad idea to me, especially considering you don't even get STAB off of it. I think Thunderbolt is a far more deserving slash next to Hidden Power [Ice], or even next to Trick.

What about MYSTICgar? PS make sure to slash Pain Split over protect. It works great, allowing Gengar to beat Blissey/Chansey (I've done it several times). I found I never really use Protect, I just dive straight into the appropriate SE attack

Moderator

I think that you may also add in OC little mention about new boosted Disable. Disable with Subtitute and Toxic Spikes support may be extremely annoying against non-prepared teams. But Toxic Spikes is a must. Or if you think it's viable enough, slash it in SubSplit set in place of Focus Blast.

The "lead" isn't really that helpful very much since a) people see teams before the match and can switch their lead accordingly to counter Gengar. Icy Wind will essentially become a waste of a moveslot. If not using Icy Wind, why not try a sweeper set?

I don't think Psychic even deserves a slash on the Choice set. You're going to lock yourself into an attack that common Pursuit-users are immune to/resist? Seems like a bad idea to me, especially considering you don't even get STAB off of it. I think Thunderbolt is a far more deserving slash next to Hidden Power [Ice], or even next to Trick.

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HP Ice has worked to deal damage to Dragons, particularly Garchomp with that awkward base 102 speed. It also OHKOs Salamence and Skymin. I've tried out Thunderbolt, and it hasn't really been that helpful for me since the only thing to hit it with worthwhile is Gyara. The only other common water type I've seen is Burungeru, who is hit harder by Shadow Ball.
I do agree with your point on Psychic, but the reason why I have it slashed is so that it could threaten fighting types, specifically Roopushin who has the ability to break most teams' "Nattoguru" combination and is generally a powerful threat that Gengar could check, provided it doesn't Payback on the switch of course.

The main issue I have with that set is that Gengar is very frail at taking hits, even when the enemy is burnt. If Hypnosis misses, Gengar may very well have just died during the turn it missed. That's my main issue with Double Status Gengar. Also, just because a set works well in 4th gen does not necessarily mean it will work in 5th gen.

What about MYSTICgar? PS make sure to slash Pain Split over protect. It works great, allowing Gengar to beat Blissey/Chansey (I've done it several times). I found I never really use Protect, I just dive straight into the appropriate SE attack

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MYSTICGar if i remember correctly was developed during a meta where Scizor was prominent and was on at least a 5th of everybody's teams. Frankly, I have not seen many Scizors and Ttars it probably is not very viable in this meta due to the dominance and popularity of other threats such as Roopushin, (the current) Darkrai and Skymin.